chore(cleanup): Phase 5 contracts removal + tmp directive + 30-day expiry + scroll fix (#118)

Sweeping cleanup across the surface and the wire. Net: -14k LOC of legacy
contracts code, plus the tmp/scroll/UX fixes the user asked for.

## Sidebar/editor independent scroll
Replace `height: calc(100vh - 80px)` (which assumed an 80px masthead and
quietly clipped or pushed the whole page below the fold when the masthead
was taller) with `h-screen + overflow-hidden` on the page root and proper
`flex-1 min-h-0` sizing on `<main>`. Sidebar and editor pane now manage
their own scroll independently; the page itself never scrolls.

Same fix in /tmp/:taskId.

## tmp directive — real backing for orphans/ephemerals

New migration `20260501100000_tmp_directive_and_clear_orphans.sql`:
  * Adds `directives.is_tmp` BOOLEAN NOT NULL DEFAULT false.
  * Partial unique index `(owner_id) WHERE is_tmp` — at most ONE tmp
    directive per owner.
  * Hard-deletes every existing orphan task (`directive_id IS NULL`).
    Per the user spec: "ALSO there are TOO MANY old tasks in tmp, we
    need to remove all of them as well."

New repository helpers:
  * `get_or_create_tmp_directive(pool, owner_id) -> Directive`
    INSERT ON CONFLICT DO NOTHING + fallback SELECT, race-safe.
  * `list_all_tmp_directives` — drives the expiry sweep.
  * `delete_expired_tmp_tasks(tmp_directive_id) -> u64`.
  * `list_tmp_tasks_for_owner` (replaces `list_orphan_tasks_for_owner`).

`mesh::create_task`: every top-level task must have a directive. If a
caller doesn't supply `directive_id` and isn't a subtask, attach to the
caller's tmp directive (auto-creating it on first use).

`list_directives_for_owner` filters out `is_tmp=true` so the scratchpad
directive doesn't pollute the contract list — surfaced via the sidebar's
`tmp/` folder instead.

## 30-day expiry on tmp tasks

New `phase_tmp_expiry` in the directive reconciler. Throttled to once per
hour: enumerates every tmp directive, calls `delete_expired_tmp_tasks`,
logs the count. The actual delete is `WHERE created_at < NOW() - INTERVAL
'30 days'` and is fast on the existing index. Subtasks die via FK cascade.

## Phase 5 — contracts removed

### Frontend
Deleted entire `/contracts` surface:
  * routes: `contracts.tsx`, `contract-file.tsx`
  * components/contracts: ContractList, ContractDetail, ContractCliInput,
    ContractContextMenu, CommandModePanel, PhaseBadge, PhaseHint,
    PhaseDeliverablesPanel, PhaseProgressBar, QuickActionButtons,
    RepositoryPanel, TaskDerivationPreview
  * (Kept `PhaseConfirmationModal` — used outside the contracts surface
    by `TaskOutput` and `PhaseConfirmationNotification`.)
  * Routes deregistered from `main.tsx`; nav entry removed from
    `NavStrip`.

### Backend handlers
Deleted: `contracts.rs` (2.4k LOC), `contract_chat.rs` (3.2k LOC),
`contract_daemon.rs` (~940 LOC), `contract_discuss.rs` (~590 LOC),
`transcript_analysis.rs` (~690 LOC). All `/api/v1/contracts/*` routes
deregistered. OpenAPI entries dropped. Module declarations removed from
`server/handlers/mod.rs`.

### CLI
Removed `makima contract` and `makima supervisor` subcommands. Deleted
`daemon/cli/contract.rs` and `daemon/cli/supervisor.rs`. Bin dispatch
trimmed (~377 LOC).

### Orchestrator
Removed the contract-spawn path from `phase_execution`
(`spawn_step_contract` and its caller). `directive_steps.contract_type`
now logs a warning and falls through to standalone-task spawn. Column
itself stays — old data still reads, just no longer triggers a
contract+supervisor spawn.

### TUI
`Action::PerformCreateContract` is now a no-op that surfaces a status
message: "Contracts have been removed. Use directives instead." The TUI
form is dead code pending a wider refresh.

## Out of scope (deliberately left)

* Contracts DB tables (`contracts`, `contract_repositories`,
  `contract_chat_history`, `contract_events`, `contract_templates`) are
  retained for historical data + because some peripheral code still
  joins to them in TaskSummary queries.
* `mesh_supervisor` handlers are retained — they aren't only used by
  contracts (some mesh-level supervisor behaviour persists), and the
  cross-cutting cleanup is bigger than this PR.
* `directive_steps.contract_type` column itself isn't dropped; just no
  longer functional.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

1 files changed, 0 insertions, 221 deletions

diff --git a/makima/frontend/src/components/contracts/TaskDerivationPreview.tsx b/makima/frontend/src/components/contracts/TaskDerivationPreview.tsx
deleted file mode 100644
index 07421ef..0000000
--- a/makima/frontend/src/components/contracts/TaskDerivationPreview.tsx
+++ /dev/null
@@ -1,221 +0,0 @@
-import { useState, useCallback } from "react";
-
-export interface ParsedTask {
-  name: string;
-  description?: string;
-  group?: string;
-  order: number;
-  completed: boolean;
-  dependencies: string[];
-}
-
-interface TaskDerivationPreviewProps {
-  tasks: ParsedTask[];
-  groups: string[];
-  fileName: string;
-  onCreateTasks: (selectedTasks: ParsedTask[]) => void;
-  onCancel: () => void;
-  loading?: boolean;
-}
-
-export function TaskDerivationPreview({
-  tasks,
-  groups,
-  fileName,
-  onCreateTasks,
-  onCancel,
-  loading = false,
-}: TaskDerivationPreviewProps) {
-  const [selectedIndices, setSelectedIndices] = useState<Set<number>>(
-    new Set(tasks.map((_, i) => i)) // Select all by default
-  );
-
-  const toggleTask = useCallback((index: number) => {
-    setSelectedIndices((prev) => {
-      const newSet = new Set(prev);
-      if (newSet.has(index)) {
-        newSet.delete(index);
-      } else {
-        newSet.add(index);
-      }
-      return newSet;
-    });
-  }, []);
-
-  const selectAll = useCallback(() => {
-    setSelectedIndices(new Set(tasks.map((_, i) => i)));
-  }, [tasks]);
-
-  const selectNone = useCallback(() => {
-    setSelectedIndices(new Set());
-  }, []);
-
-  const handleCreate = useCallback(() => {
-    const selectedTasks = tasks.filter((_, i) => selectedIndices.has(i));
-    onCreateTasks(selectedTasks);
-  }, [tasks, selectedIndices, onCreateTasks]);
-
-  // Group tasks by their group property
-  const tasksByGroup = tasks.reduce((acc, task, index) => {
-    const groupKey = task.group || "Ungrouped";
-    if (!acc[groupKey]) {
-      acc[groupKey] = [];
-    }
-    acc[groupKey].push({ task, index });
-    return acc;
-  }, {} as Record<string, { task: ParsedTask; index: number }[]>);
-
-  const selectedCount = selectedIndices.size;
-  const totalCount = tasks.length;
-
-  return (
-    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50">
-      <div className="w-full max-w-2xl p-6 bg-[#0a1628] border border-[rgba(117,170,252,0.3)] max-h-[80vh] flex flex-col">
-        {/* Header */}
-        <div className="flex items-center justify-between mb-4">
-          <div>
-            <h3 className="font-mono text-sm text-[#75aafc] uppercase">
-              Create Tasks from Document
-            </h3>
-            <p className="font-mono text-xs text-[#555] mt-1">
-              Source: {fileName}
-            </p>
-          </div>
-          <div className="flex items-center gap-2">
-            <button
-              onClick={selectAll}
-              className="font-mono text-[10px] text-[#75aafc] hover:text-[#9bc3ff] transition-colors"
-            >
-              Select All
-            </button>
-            <span className="text-[#555]">|</span>
-            <button
-              onClick={selectNone}
-              className="font-mono text-[10px] text-[#75aafc] hover:text-[#9bc3ff] transition-colors"
-            >
-              Select None
-            </button>
-          </div>
-        </div>
-
-        {/* Task List */}
-        <div className="flex-1 overflow-y-auto space-y-4 mb-4">
-          {groups.length > 0 ? (
-            // Grouped view
-            Object.entries(tasksByGroup).map(([groupName, groupTasks]) => (
-              <div key={groupName} className="space-y-2">
-                <h4 className="font-mono text-xs text-[#9bc3ff] uppercase border-b border-[rgba(117,170,252,0.2)] pb-1">
-                  {groupName}
-                </h4>
-                {groupTasks.map(({ task, index }) => (
-                  <TaskItem
-                    key={index}
-                    task={task}
-                    index={index}
-                    selected={selectedIndices.has(index)}
-                    onToggle={() => toggleTask(index)}
-                  />
-                ))}
-              </div>
-            ))
-          ) : (
-            // Flat view
-            tasks.map((task, index) => (
-              <TaskItem
-                key={index}
-                task={task}
-                index={index}
-                selected={selectedIndices.has(index)}
-                onToggle={() => toggleTask(index)}
-              />
-            ))
-          )}
-        </div>
-
-        {/* Footer */}
-        <div className="flex items-center justify-between pt-4 border-t border-[rgba(117,170,252,0.2)]">
-          <span className="font-mono text-xs text-[#555]">
-            {selectedCount} of {totalCount} tasks selected
-          </span>
-          <div className="flex gap-2">
-            <button
-              onClick={onCancel}
-              disabled={loading}
-              className="px-4 py-2 font-mono text-xs text-[#9bc3ff] hover:text-[#dbe7ff] transition-colors disabled:opacity-50"
-            >
-              Cancel
-            </button>
-            <button
-              onClick={handleCreate}
-              disabled={loading || selectedCount === 0}
-              className="px-4 py-2 font-mono text-xs text-[#dbe7ff] bg-[#0f3c78] border border-[#3f6fb3] hover:bg-[#153667] transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
-            >
-              {loading ? "Creating..." : `Create ${selectedCount} Task${selectedCount !== 1 ? "s" : ""}`}
-            </button>
-          </div>
-        </div>
-
-        {/* Chaining info */}
-        {selectedCount > 1 && (
-          <p className="font-mono text-[10px] text-[#555] mt-2 text-center">
-            Tasks will be chained: each task continues from the previous one's work
-          </p>
-        )}
-      </div>
-    </div>
-  );
-}
-
-function TaskItem({
-  task,
-  index,
-  selected,
-  onToggle,
-}: {
-  task: ParsedTask;
-  index: number;
-  selected: boolean;
-  onToggle: () => void;
-}) {
-  return (
-    <button
-      onClick={onToggle}
-      className={`w-full text-left p-3 border transition-colors ${
-        selected
-          ? "border-[#75aafc] bg-[rgba(117,170,252,0.1)]"
-          : "border-[rgba(117,170,252,0.15)] hover:border-[rgba(117,170,252,0.3)]"
-      }`}
-    >
-      <div className="flex items-start gap-2">
-        <span
-          className={`font-mono text-xs mt-0.5 ${
-            selected ? "text-[#75aafc]" : "text-[#555]"
-          }`}
-        >
-          {selected ? "[x]" : "[ ]"}
-        </span>
-        <div className="flex-1 min-w-0">
-          <div className="flex items-center gap-2">
-            <span className="font-mono text-[10px] text-[#555]">#{index + 1}</span>
-            <span className="font-mono text-sm text-[#dbe7ff]">{task.name}</span>
-            {task.completed && (
-              <span className="font-mono text-[9px] text-green-400 uppercase">
-                done in source
-              </span>
-            )}
-          </div>
-          {task.description && (
-            <p className="font-mono text-xs text-[#555] mt-1 truncate">
-              {task.description}
-            </p>
-          )}
-          {task.dependencies.length > 0 && (
-            <p className="font-mono text-[10px] text-[#75aafc] mt-1">
-              Depends on: {task.dependencies.join(", ")}
-            </p>
-          )}
-        </div>
-      </div>
-    </button>
-  );
-}